A mobile device includes a pair of cabinet half-bodies 10, 6 configuring a cabinet 1; a metal coupling member 2 for coupling the cabinet half-bodies 10, 6; and a synthetic resin cover body 3 opened with at least two pass holes 30, 30 through which a strap 4 is passed, and arranged with a strap receiving piece 31 between the pass holes 30, 30. The strap receiving piece 31 has a lower surface reinforced by contacting at least one part of the coupling member 2, and a space through which the strap 4 from one pass hole to the other pass hole passes is formed below the coupling member 2.